Robert Lustyik, seen Saturday at his Sleepy Hollow home, is a former FBI agent charged with trying to foil a fraud investigation in exchange for payoffs.

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Federal prosecutors are moving to disqualify the lawyer for a former FBI "spy hunter" from Sleepy Hollow who is charged in an international cloak-and-dagger conspiracy, and they have already restricted access to hundreds of classified documents they plan to use.

The legal machinations, which will play out in a Utah courtroom, are an early sign of the challenges facing both prosecutors and defense lawyers, who will navigate through hundreds of classified records of alleged secret meetings, overseas trips and covert messages at the heart of the case.